Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Mar  4 17:50:10 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger586680
======================================================================

  Trigger: 00586680      Segment: 000

  BAT Trigger Time: 414130041.92   [s; MET]
      Trigger Stop: 414130042.944   [s; MET]
               UTC: 2014-02-15T04:07:10.273340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 104.135942727015   Dec: 41.7803604777544  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.63
     Image Trigger?:     NO
     Rate S/N Ratio:     58.6344608570762  [ if not an image trigger ]
     Image S/N Ratio:    12.63

  Analysis Position:   [ source = BAT ]
    RA: 104.135942727015   Dec: 41.7803604777544  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 104.131035415408   Dec: 41.7870063941203  [deg; J2000]  
        { 06h 56m 31.4s , +41d 47' 13.2" }
         +/- 1.11504409092991 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.474871573306095 [arcmin] (formal 1-sigma fit error)
    SNR: 26.0350443650305
 
  Angular difference between the analysis and refined position is 0.455202 arcmin
 
  Partial Coding Fraction: 0.1542969    [ including projection effects ]

  Duration
     T90: 25.6320000290871 +/- 5.64181532462767
        Measured from: -0.304000020027161
                   to: 25.3280000090599     [s; relative to TRIGTIME]
     T50: 8.78400003910065 +/- 0.840875777678445
        Measured from: 1.74399995803833
                   to: 10.527999997139     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0120000243186951     
                   to: 0.987999975681305     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.47200000286102     
                   to: 35.8560000061989     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.647878   3.072008   3.280514   1.500788
           0.108582   0.122947   0.118974   0.099929 [error]
 Peak      0.140164   0.302490   0.404192   0.142714
           0.021060   0.027269   0.030847   0.023297 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   37.328   -1.472   35.856
T90    25.632   -0.304   25.328
T50     8.784    1.744   10.528
Peak    1.000   -0.012    0.988
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.099    -0.072      0.073       -           -               -         1.86e-02     -7.65e-04          7.63e-04      53.370   57
CPL     -1.098    -0.069      0.135     9999.360    -9999.360      -9999.360      1.86e-02     -7.44e-04          3.36e-03      53.440   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -0.928     -0.145     0.148       -           -               -         6.88e-02     -6.21e-03          6.18e-03      56.570   57
CPL     -0.613     -0.384     0.610      268.666    -268.666      -268.666      9.38e-02     -2.95e-02          7.17e-02      55.600   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   6.08e-07  1.43e-06  2.67e-06  1.20e-05  7.24e-06  1.67e-05   erg/cm2
      90%_error_low -5.28e-08 -7.48e-08 -1.15e-07 -1.18e-06 -3.00e-07 -1.22e-06   erg/cm2
      90%_error_hi   5.46e-08  7.43e-08  1.14e-07  1.26e-06  3.00e-07  1.30e-06   erg/cm2
Peak flux       PL   4.75e-04  5.86e-03  6.68e-02  5.81e+00  3.00e-01  5.81e+00   ph/cm2/s
      90%_error_low -4.07e-05 -4.79e-04 -5.94e-03 -5.19e-01 -2.43e-02 -4.60e-01   ph/cm2/s
      90%_error_hi   3.02e-04  3.26e-03  3.01e-02  1.79e+00  1.28e-01  1.92e+00   ph/cm2/s
 
Fluence        CPL   6.22e-07  1.43e-06  2.64e-06  1.31e-05  7.27e-06  1.80e-05   erg/cm2
      90%_error_low    N/A    -8.76e-08    N/A       N/A    -3.25e-07    N/A      erg/cm2
      90%_error_hi     N/A     9.14e-08    N/A       N/A     2.75e-07    N/A      erg/cm2
Peak flux      CPL   1.50e+00  2.36e+00  2.56e+00  3.58e+00  7.85e+00  1.00e+01   ph/cm2/s
      90%_error_low -3.63e-01 -2.77e-01 -3.00e-01 -1.34e+00 -7.21e-01 -1.53e+00   ph/cm2/s
      90%_error_hi   3.64e-01  2.80e-01  3.10e-01  1.50e+00  7.21e-01  1.74e+00   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  104.1310    41.7870   0.0074    46.6078   155.6688         8.1692408     26.035 TRIG_00586680                 
 
Foreground time interval of the image:
 -1.472  14.981 (delta_t =  16.453 [sec])
Background time interval of the image:
-239.920  -1.472 (delta_t = 238.448 [sec])




    Light Curves

    Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

    Full-time range; 1 s binning

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -1.472 sec. to   35.856 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09874     ( -0.0724535   0.0733605 )
Norm@50keV  : 1.85515E-02    ( -0.000765325   0.000762752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.37 using 59 PHA bins.
# Reduced chi-squared =         0.9363 for     57 degrees of freedom 
# Null hypothesis probability =   6.120264e-01
 
Photon flux (15-150 keV)    in 37.33 sec: 2.15158 ( -0.09374  0.09409 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.24415e-06 ( -2.99536e-07  2.99962e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.472 sec. to   35.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09762     ( -0.0700096   0.134159 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.86361E-02    ( -0.000766376   0.00333993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.44 using 59 PHA bins.
# Reduced chi-squared =         0.9542 for     56 degrees of freedom 
# Null hypothesis probability =   5.724894e-01
 
Photon flux (15-150 keV)    in 37.33 sec: 2.16302 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.26789e-06 ( -3.24557e-07  2.74831e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.012 sec. to    0.988 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.927833     ( -0.144951   0.147941 )
Norm@50keV  : 6.87777E-02    ( -0.00620998   0.00618281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.57 using 59 PHA bins.
# Reduced chi-squared =         0.9924 for     57 degrees of freedom 
# Null hypothesis probability =   4.912277e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.299959 0.224172 4.01286E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.63748e-07 ( -7.21559e-08  7.23939e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.012 sec. to    0.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.612723     ( -0.384724   0.609685 )
Epeak [keV] : 268.666      ( -268.456 -268.456 )
Norm@50keV  : 9.38383E-02    ( -0.0295047   0.071717 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.60 using 59 PHA bins.
# Reduced chi-squared =         0.9928 for     56 degrees of freedom 
# Null hypothesis probability =   4.901357e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.85098 ( -0.72062  0.72144 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.61798e-07 ( -7.33994e-08  7.3228e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 25.632 sec.
Hardness ratio (energy fluence ratio) = 1.86771221261

    S(15-50 keV) vs. S(50-150 keV) plot 

    S(15-50 keV)  = 2.037909e-06
S(50-150 keV) = 5.206354e-06

    The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




    Mask shadow pattern 

    IMX = -9.638086568856981E-01, IMY = -4.358076949019931E-01

    Spacecraft aspect plot

    Bright source in the pre-burst/pre-slew/post-slew images

    Pre-burst image of 15-350 keV band 

    Time interval of the image:
-239.920000 -1.472000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
109.7571  30.5394    2.8  46.5  138.9   4.2201   4.1 ------	UNKNOWN                       
161.1466  15.7843    3.4  22.8   53.1   0.8800   3.4 ------	UNKNOWN                       
194.8764  -7.4623    2.3  52.9    3.9   3.3668   5.0 ------	UNKNOWN                       
223.8811  84.9261    3.0  49.2 -133.7   4.2546   3.9 ------	UNKNOWN                       
223.5093  71.1299    2.5  43.8 -116.2   5.1476   4.7 ------	UNKNOWN                       
227.0921  79.6737    2.7  47.4 -127.1   4.5142   4.2 ------	UNKNOWN

    Pre-slew background subtracted image of 15-350 keV band 

    Time interval of the image:
-1.472000 14.980600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
182.0660 -13.4622    3.2  53.8   21.3   1.2487   3.6 ------	UNKNOWN                       
104.1310  41.7870    0.4  46.6  155.7   8.1688  26.0 ------	UNKNOWN                       
198.9244  31.1300    2.7  27.7  -44.6   0.3223   4.3 ------	UNKNOWN                       
222.3708  52.2314    2.4  40.9  -88.3   1.0883   4.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
105.380610 962.150000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6251  22.0158    0.2  26.2 -156.1  21.0297  46.5    0.5	Crab                          
136.1658  12.7169    3.9  40.2  103.4   5.0623   3.0 ------	UNKNOWN                       
 95.5681  -2.9443    2.7  45.4  168.6   3.9109   4.2 ------	UNKNOWN                       
 43.1048  55.0778    2.6  41.1  -73.1   7.2845   4.4 ------	UNKNOWN                       
 51.8114  31.1664    3.4  42.7 -110.3   5.8578   3.4 ------	UNKNOWN